Tính:
a. (x – 1)2
b. (3 – y)2
c. (x - 1/2)2
a. (x – 1)2 = x2 –2x + 1
b. (3 – y)2 = 9 – 6y + y2
c. (x - 1/2 )2 = x2 – x + 1/4
-- Mod Toán 8
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